With a nod to Benjamin regarding box-thinking: the kindly folks at Cold Steel have the answer: a boar spear. (http://www.coldsteel.com/spears-high-performance-spears.html)Such spears were popular in Europe in the pre-firearm days for hunting wild boars. They have a wide, elliptical blade and behind it, a T-shaped cross-bar to keep the impaled boar from running up the shaft and doing wild-boar stuff (goring, tusking, stomping) to the hunter. Modify the walking staff to accept the spear-tip, carry the blade in a belt sheath, and have the ideal dog poker. And since Blast camps among the piggies, it might have other uses for him

Bayonet would do the same job, on lugged walking stick or military rifle. The SMLE and Springfield fans would be particularly well equipped with the long bayonets issued for those weapons. Back in the fifties, the neighborhood surplus shop had barrels full on Springfield and Enfield bayonets at $5 each. *sigh*